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Aerospace Notes

Aerospace Notes showed that even if several satellites were blocked by the aircraft during manoeuvres, only two were needed for a complete attitude solution. Throughout the tests, the antennas always had at least two satellites in view, even during steep manoeuvres. The receiver handled 360-deg turns with 45-deg angle of bank without losing attitude lock. Automatic de-icing humans or even damage internal organs A trimble tans vector attitude receiver A new device, produced by Rosemount at short enough ranges. was used as the sensor for the experi­ Inc., is said to be the only FAAcertified, Additionally, there are plans for ments, with a 486 laptop computer pro­ primary ice-detection system. A primary smaller acoustic weapons to cause dis­ viding both real-time display and data system is one that automatically initiates ruption for short periods. recording for post-flight analysis. The de-icing instead of issuing an advisory. Another Los Alamos development is receiver was set to take measurements at In effect, the crew must rely completely the "optical flash" 40mm artillery shell. a 10-z rate. Knowing the placement of on the system to detect and correct icing Filled with plastic dye laser rods, it can the antenna on the wings to subcentime- conditions. tre accuracy is necessary to obtain accu­ put out a flash of light brilliant enough rate attitude readings. Little is widely known about in-flight to temporarily blind personnel or sensor systems. The plastic rods can be de-icing. Ice forms on aircraft surfaces The flight tests used impulse inputs to replaced in one minute, ensuring a shell as the plane flies through supercooled the elevator and rudder to evaluate the is fully charged before firing. water droplets that follow the airflow dynamic response of the GPS attitude around the vehicle. The severity of the Work is also underway on microbes sensors. After applying the impulse, the icing depends on liquid water content, that could turn aviation fuel in storage pilot took his hands off the controls and droplet size, airspeed geometry and tanks to a useless jelly. A chemical observed the aircraft response. temperature. Most de-icing systems pro­ sprayed on roads and runways would GPS offers a relatively low-cost tool vide warnings to the flight crew when make rubber tyres on vehicles or aircraft that can characterise an aircraft's perfor­ icing has been detected. The crew then brittle and useless. An electromagnetic mance in minutes. monitors conditions and manually turns pulse generator, activated by conven­ the de-icer on. tional explosives, would damage unpro­ tected electrical circuits in radar, com­ Rosemount's ice detector uses an munications and weapon system equip­ ultrasonic vibrating probe to detect ice, Murerx Stub Tub Campaign ment. Ceramic shards fired into the air which has a normal operating frequency Continued from page 20 could damage but not destroy aircraft of 40,000 Hz. As ice collects, the fre­ Collecting stubs in the tubs will make engines or degrade stealth designs quency decreases. When the ice reaches factory floors tidier and safer, while enough tomake them visible to radar. a predetermined thickness, the probe's allowing scrap material to be recycled. internal heating element is turned on, de- At least one non-lethal weapon was Every tub carries the BHF logo and for icing in five to seven seconds. A micro­ every one requested Murex is making a used during the Persian Gulf war to pre­ processor collects the probe's data in a contribution to the British Heart vent U.S. air crew casualties and long- canister connected to the probe, and Foundation. term damage to Iraqi public utilities. determines when the ice build up Carbon fibre-filled warheads on In addition to distributing Stub requires action. Signals from the micro­ Tomahawk cruise missiles shorted out Tubs, Murex is making product pur­ processor activate the plane's hot-air commercial electricitygenerating plants chase-relate d contributions to its systems to remove ice from the engine that powered Iraqi's air defence comput­ British Heart Foundation £10,000 cowls and wings. The cockpit also ers. With the computers out of action fund. On receipt of proof of purchase receives a signal, notifying the pilot that each air defence site had to operate for five packs of general purpose the ice-removal systems have been acti­ alone, making it vulnerable to destruc­ welding electrodes, Murex will con­ vated. tion by allied attack. tribute £5.00 to the fund. For a Stub Tubs Application Form, GPS used to determine aircraft atti­ contact The Publicity Department, Non-lethal weapons A diverse arsenal of non-lethal or dis­ tude Murex Welding Products Ltd, abling weapons that may enable U.N. or Research workers at Stanford University Hertford Road, Waltham Cross, Herts other peacekeeping forces to defend say in-flight tests they have performed EN8 7RP. Tel: 0992 710000, Fax 0992 719191. themselves without triggering full-scale with a Piper Dakota show that GPS can conflict are being developed by Los be used to determine aircratt attitude. Alamos National Laboratory and other Four GPS microstrip patch antennas defence research sites. were mounted on the Piper Dakota The July issue of Devices that could disable key elec­ one on each wingtip, one on top of the Aircraft Engineering tronic equipment, blind weapons sensors fuselage and one atop the vertical tail. or shut off the power to a capital city The tests put to rest one of the reputed and technology will could enable peacekeeping forces to sta­ stumbling blocks to GPS-determined feature: Super com­ bilise a volatile situation. attitude that GPS data would be lost when the aircraft manoeuvred. Usually One technology under development, puters and their part an acoustic weapon, could produce five satellites arc visible to the antennas, sound at frequencies and volumes that and four arc required to determine posi­ in the industry tion in three dimensions. But test data could break windows, incapacitate AIRCRAFT ENGINEERING - JUNE 1993 23 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

Aerospace Notes

Aircraft Engineering and Aerospace Technology , Volume 65 (6): 1 – Jun 1, 1993
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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb060326
Publisher site
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Abstract

showed that even if several satellites were blocked by the aircraft during manoeuvres, only two were needed for a complete attitude solution. Throughout the tests, the antennas always had at least two satellites in view, even during steep manoeuvres. The receiver handled 360-deg turns with 45-deg angle of bank without losing attitude lock. Automatic de-icing humans or even damage internal organs A trimble tans vector attitude receiver A new device, produced by Rosemount at short enough ranges. was used as the sensor for the experi­ Inc., is said to be the only FAAcertified, Additionally, there are plans for ments, with a 486 laptop computer pro­ primary ice-detection system. A primary smaller acoustic weapons to cause dis­ viding both real-time display and data system is one that automatically initiates ruption for short periods. recording for post-flight analysis. The de-icing instead of issuing an advisory. Another Los Alamos development is receiver was set to take measurements at In effect, the crew must rely completely the "optical flash" 40mm artillery shell. a 10-z rate. Knowing the placement of on the system to detect and correct icing Filled with plastic dye laser rods, it can the antenna on the wings to subcentime- conditions. tre accuracy is necessary to obtain accu­ put out a flash of light brilliant enough rate attitude readings. Little is widely known about in-flight to temporarily blind personnel or sensor systems. The plastic rods can be de-icing. Ice forms on aircraft surfaces The flight tests used impulse inputs to replaced in one minute, ensuring a shell as the plane flies through supercooled the elevator and rudder to evaluate the is fully charged before firing. water droplets that follow the airflow dynamic response of the GPS attitude around the vehicle. The severity of the Work is also underway on microbes sensors. After applying the impulse, the icing depends on liquid water content, that could turn aviation fuel in storage pilot took his hands off the controls and droplet size, airspeed geometry and tanks to a useless jelly. A chemical observed the aircraft response. temperature. Most de-icing systems pro­ sprayed on roads and runways would GPS offers a relatively low-cost tool vide warnings to the flight crew when make rubber tyres on vehicles or aircraft that can characterise an aircraft's perfor­ icing has been detected. The crew then brittle and useless. An electromagnetic mance in minutes. monitors conditions and manually turns pulse generator, activated by conven­ the de-icer on. tional explosives, would damage unpro­ tected electrical circuits in radar, com­ Rosemount's ice detector uses an munications and weapon system equip­ ultrasonic vibrating probe to detect ice, Murerx Stub Tub Campaign ment. Ceramic shards fired into the air which has a normal operating frequency Continued from page 20 could damage but not destroy aircraft of 40,000 Hz. As ice collects, the fre­ Collecting stubs in the tubs will make engines or degrade stealth designs quency decreases. When the ice reaches factory floors tidier and safer, while enough tomake them visible to radar. a predetermined thickness, the probe's allowing scrap material to be recycled. internal heating element is turned on, de- At least one non-lethal weapon was Every tub carries the BHF logo and for icing in five to seven seconds. A micro­ every one requested Murex is making a used during the Persian Gulf war to pre­ processor collects the probe's data in a contribution to the British Heart vent U.S. air crew casualties and long- canister connected to the probe, and Foundation. term damage to Iraqi public utilities. determines when the ice build up Carbon fibre-filled warheads on In addition to distributing Stub requires action. Signals from the micro­ Tomahawk cruise missiles shorted out Tubs, Murex is making product pur­ processor activate the plane's hot-air commercial electricitygenerating plants chase-relate d contributions to its systems to remove ice from the engine that powered Iraqi's air defence comput­ British Heart Foundation £10,000 cowls and wings. The cockpit also ers. With the computers out of action fund. On receipt of proof of purchase receives a signal, notifying the pilot that each air defence site had to operate for five packs of general purpose the ice-removal systems have been acti­ alone, making it vulnerable to destruc­ welding electrodes, Murex will con­ vated. tion by allied attack. tribute £5.00 to the fund. For a Stub Tubs Application Form, GPS used to determine aircraft atti­ contact The Publicity Department, Non-lethal weapons A diverse arsenal of non-lethal or dis­ tude Murex Welding Products Ltd, abling weapons that may enable U.N. or Research workers at Stanford University Hertford Road, Waltham Cross, Herts other peacekeeping forces to defend say in-flight tests they have performed EN8 7RP. Tel: 0992 710000, Fax 0992 719191. themselves without triggering full-scale with a Piper Dakota show that GPS can conflict are being developed by Los be used to determine aircratt attitude. Alamos National Laboratory and other Four GPS microstrip patch antennas defence research sites. were mounted on the Piper Dakota The July issue of Devices that could disable key elec­ one on each wingtip, one on top of the Aircraft Engineering tronic equipment, blind weapons sensors fuselage and one atop the vertical tail. or shut off the power to a capital city The tests put to rest one of the reputed and technology will could enable peacekeeping forces to sta­ stumbling blocks to GPS-determined feature: Super com­ bilise a volatile situation. attitude that GPS data would be lost when the aircraft manoeuvred. Usually One technology under development, puters and their part an acoustic weapon, could produce five satellites arc visible to the antennas, sound at frequencies and volumes that and four arc required to determine posi­ in the industry tion in three dimensions. But test data could break windows, incapacitate AIRCRAFT ENGINEERING - JUNE 1993 23

Journal

Aircraft Engineering and Aerospace Technology – Emerald Publishing

Published: Jun 1, 1993

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